1. Click on the drop down arrow next to Files and select Photos. 

2. Click Add Photo and then either drag/drop a photo file in the blue border box or click Select Files to open your file explorer for you computer. Once your files are in the upload box click Start Upload. 

3. Once the file is uploaded, if it is the subject photo I recommend clicking the primary photo toggle to yes. This will have the photograph populate in the top right corner of your screen while you are in the specific case file.